KNL-963 Virus scanning can be slow, need to queue scans in a thread and periodically scan to avoid making the user wait and hold up threads
Patch from John Bush (AHI)



git-svn-id: https://source.sakaiproject.org/svn/kernel/trunk@130222 66ffb92e-73f9-0310-93c1-f5514f145a0a